/*
 *  Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef MODULES_AUDIO_PROCESSING_NS_HISTOGRAMS_H_
#define MODULES_AUDIO_PROCESSING_NS_HISTOGRAMS_H_

#include <array>

#include "array_view.h"
#include "ns_common.h"
#include "signal_model.h"

namespace webrtc {

    constexpr int kHistogramSize = 1000;

// Class for handling the updating of histograms.
    class Histograms {
    public:
        Histograms();

        Histograms(const Histograms &) = delete;

        Histograms &operator=(const Histograms &) = delete;

        // Clears the histograms.
        void Clear();

        // Extracts thresholds for feature parameters and updates the corresponding
        // histogram.
        void Update(const SignalModel &features_);

        // Methods for accessing the histograms.
        rtc::ArrayView<const int, kHistogramSize> get_lrt() const { return lrt_; }

        rtc::ArrayView<const int, kHistogramSize> get_spectral_flatness() const {
            return spectral_flatness_;
        }

        rtc::ArrayView<const int, kHistogramSize> get_spectral_diff() const {
            return spectral_diff_;
        }

    private:
        std::array<int, kHistogramSize> lrt_{};
        std::array<int, kHistogramSize> spectral_flatness_{};
        std::array<int, kHistogramSize> spectral_diff_{};
    };

}  // namespace webrtc

#endif  // MODULES_AUDIO_PROCESSING_NS_HISTOGRAMS_H_
